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  <title>Transfer data between file descriptors</title>
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  <div id="layout-content"><div id="function.eio-sendfile" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">eio_sendfile</h1>
  <p class="verinfo">(PECL eio &gt;= 0.0.1dev)</p><p class="refpurpose"><span class="refname">eio_sendfile</span> &mdash; <span class="dc-title">Transfer data between file descriptors</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.eio-sendfile-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>eio_sendfile</strong></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$out_fd</code></span>
   , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$in_fd</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$pri</code></span>
   [, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
  ]]] ) : <span class="type">resource</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>eio_sendfile()</strong></span> copies  data between one file descriptor
   and another. See <em>SENDFILE(2)</em> man page for details.
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-function.eio-sendfile-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<code class="parameter">out_fd</code></dt>

    <dd>

     <p class="para">
     Output stream, Socket resource, or file descriptor. Should be opened for writing.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">in_fd</code></dt>

    <dd>

     <p class="para">
     Input stream, Socket resource, or file descriptor. Should be opened for reading.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">offset</code></dt>

    <dd>

     <p class="para">
     Offset within the source file.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">length</code></dt>

    <dd>

     <p class="para">
     Number of bytes to copy.
     </p>
    </dd>

   
   
    <dt>
<code class="parameter">pri</code></dt>

    <dd>

    <p class="para">请求的优先级：<strong><code>EIO_PRI_DEFAULT</code></strong>，<strong><code>EIO_PRI_MIN</code></strong>，<strong><code>EIO_PRI_MAX</code></strong> 或 <strong><code>NULL</code></strong>。如果是
<strong><code>NULL</code></strong>，<code class="parameter">pri</code> 将设为
<strong><code>EIO_PRI_DEFAULT</code></strong>。
</p>

    </dd>

   
   
    <dt>
<code class="parameter">callback</code></dt>

    <dd>

     <p class="para">
<code class="parameter">callback</code>
函数在请求完成时被调用。其应匹配一下原型：<div class="example-contents"><div class="phpcode"><pre><span style="color: #000000">
void&nbsp;callback(mixed&nbsp;$data,&nbsp;int&nbsp;$result[,&nbsp;resource&nbsp;$req]);</span>
</pre></div></div>

<dl>

 
  <dt>
<code class="parameter">data</code></dt>

  <dd>
<p class="para">传递给请求的用户数据。</p></dd>

 
 
  <dt>
<code class="parameter">result</code></dt>

  <dd>
<p class="para">针对请求的结果的值。通常是相应的系统调用返回的值。</p></dd>

 
 
  <dt>
<code class="parameter">req</code></dt>

  <dd>
<p class="para">可选的请求资源，可被 <span class="function"><a href="eio_get_last_error.html" class="function">eio_get_last_error()</a></span>
   之类的函数使用。</p></dd>

 
</dl>

</p>

    </dd>

   
   
    <dt>
<code class="parameter">data</code></dt>

    <dd>

     <p class="para">
     Arbitrary variable passed to <code class="parameter">callback</code>.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.eio-sendfile-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   <span class="function"><strong>eio_sendfile()</strong></span> returns request resource on success or <strong><code>FALSE</code></strong> on error.
  </p>
 </div>


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